Table 2.
Characteristics of studies.
| Population selection | Number of studies |
|---|---|
| Mean age (years) | |
| [40,50) | 2 |
| [50,60) | 2 |
| [60,70) | 29 |
| ≥70 | 9 |
| Age provided as a range | 1 |
| Male (%) | |
| <30 | 1 |
| [30,60) | 15 |
| [60,90) | 19 |
| ≥90 | 5 |
| Gender not reported | 3 |
| Sample size | |
| <50 | 21 |
| [50,100) | 7 |
| [100,200) | 10 |
| ≥200 | 5 |
| Country/region | |
| North America | |
| USA | 10 |
| Europe | |
| UK | 4 |
| Other European countries a | 17 |
| Asia-Pacific countries b | 12 |
| Study design | |
| RCT | 31 |
| Non-RCT | 12 |
a
Other European countries include Germany, France, Switzerland, Portugal, Netherlands, Norway, Italy, Poland, Spain and Turkey.
b
Asia-Pacific countries include Australia, Chile, China, Indonesia, Vietnam, Korea and Japan.